Write an HTML page that contains a text ¯eld for a phone number and a button. When the button is clicked check that the text ¯eld has only numeric characters (and maybe a dash '-') in it. If not, use an alert dialog to inform the user.
What will be an ideal response?
```
A Simple Heading
This is a very simple web page. It asks you for your
phone number
and when you click the button
it will check if the phone number is okay (digits and - only).
Enter your phonenumber:
```
Computer Science & Information Technology
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